Apple Inc. is in talks to resolve a lawsuit brought by THX Ltd., the sound-engineering company founded by “Star Wars” producer George Lucas, alleging infringement of a patent for speaker technology used in iPhones, iPads and iMac products.

An iPhone application that lets users check levels of blood, protein and other substances in their urine is the first target of U.S. regulators seeking boundaries in a burgeoning industry for medical diagnosis on-the-go.